JSliderWiringHarness.java

//   Copyright 2011 Palantir Technologies
//
//   Licensed under the Apache License, Version 2.0 (the "License");
//   you may not use this file except in compliance with the License.
//   You may obtain a copy of the License at
//
//       http://www.apache.org/licenses/LICENSE-2.0
//
//   Unless required by applicable law or agreed to in writing, software
//   distributed under the License is distributed on an "AS IS" BASIS,
//   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
//   See the License for the specific language governing permissions and
//   limitations under the License.
package com.palantir.ptoss.cinch.swing;

import java.beans.IntrospectionException;
import java.lang.reflect.Field;
import java.util.Collection;

import javax.swing.JSlider;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;

import com.google.common.collect.ImmutableList;
import com.palantir.ptoss.cinch.core.BindableModel;
import com.palantir.ptoss.cinch.core.Binding;
import com.palantir.ptoss.cinch.core.BindingContext;
import com.palantir.ptoss.cinch.core.ModelUpdate;
import com.palantir.ptoss.cinch.core.WiringHarness;
import com.palantir.ptoss.cinch.swing.Bound.Wiring;
import com.palantir.ptoss.util.Mutator;

/**
 * A {@link WiringHarness} for binding a {@link JSlider} to an {@link Integer} value in a
 * {@link BindableModel}.
 */
public class JSliderWiringHarness implements WiringHarness<Bound, Field> {
    public Collection<Binding> wire(Bound bound, BindingContext context, Field field) throws IllegalAccessException, IntrospectionException {
        String target = bound.to();
        Mutator mutator = Mutator.create(context, target);
        JSlider slider = context.getFieldObject(field, JSlider.class);
        return ImmutableList.of(bindJSlider(mutator, slider));
    }

    public static Binding bindJSlider(final Mutator mutator, final JSlider slider) {
        final ChangeListener changeListener = new ChangeListener() {
            public void stateChanged(ChangeEvent e) {
                try {
                    if (!slider.getValueIsAdjusting()) {
                        mutator.set(slider.getValue());
                    }
                } catch (Exception ex) {
                    Wiring.logger.error("exception in JSlider binding", ex);
                }
            }
        };
        slider.addChangeListener(changeListener);
        Binding binding = new Binding() {
            public <T extends Enum<?> & ModelUpdate> void update(T... changed) {
                try {
                    Integer val = (Integer)mutator.get();
                    if (val == null) {
                        val = -1;
                    }
                    if (!val.equals(slider.getValue())) {
                        slider.removeChangeListener(changeListener);
                        slider.setValue(val);
                        slider.addChangeListener(changeListener);
                    }
                } catch (Exception ex) {
                    Wiring.logger.error("exception in JSlider binding", ex);
                }
            }
        };
        mutator.getModel().bind(binding);
        return binding;
    }
}